Java 多线程：startsleep/join：ThreadClassDemo.java

ThreadClassDemo.java

• Runnable hello = new DisplayMessage(Hello);
• Thread thread1 = new Thread(hello);
• thread1.setDaemon(true); // 设为守护线程
• thread1.setName(hello);
• thread1.start();
• Runnable bye = new DisplayMessage(Goodbye);
• Thread thread2 = new Thread(bye);
• thread2.setPriority(Thread.MIN_PRIORITY);
• thread2.setDaemon(true);
• thread2.start();
• thread3.join(); // 等 thread3 跑完再继续

🔒四个核心概念

• ① 线程同步　synchronized / Lock
• ② 线程间通信　wait / notify / notifyAll
• ③ 线程死锁　互相持有对方需要的锁
• ④ 线程控制　挂起、停止和恢复